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MOSAIC EVOLUTION OF THE OLDEST VERTEBRATES

SHU De gan,CHEN Ling(Northwest University,Xi′an 710069,China)  
Soft bodied Myllokunmingia ,collected from the Qiongzhusi Formation,Lower Cambrian in Haikou area,Kunming City,Yunnan Province,is buried alive and exquisitely preserved,and Haikouichthys from the same bed is also well preserved,except for slight postmortem decay.Both animals are fish shaped,possess preliminary skull,zigzag myomeres,ventro lateral fins and well developed pericardial cavity,suggesting their fulfilling the key evolutionary steps from acraniates to craniates or vertebrates.On the other hand,both they are weakly skeletonized and yet to develop true vertebrae. Haikouichthys bears multi paired gonads,which is a symplesiomorphy to lancelet,indicating its mosaic evolution. Myllokunmingia is less advanced than Haikouichthys and believed so far to be the earliest known and the most primitive ancestor in Vertebrata.
【Fund】: 科学技术部“九五”攀登计划专项!(编号 :95 - 专 -0 1);; “973”国家重点基础研究项目;; 国家自然科学基金!(编号 :49972 0 0 3 )
【CateGory Index】: Q915
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